In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

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Police identified several female victims of the "Jedi Council", variously referred to as "married moll number five" or "virgin moll". The group made references to gang-bangs and demands for more images.

Group members also allegedly exchanged images of women accompanied by offensive commentary, digitally altered images and images of naked women.

Of the six now discharged - ranging in rank from sergeant to major and from regular army and reserve units - NSW police are still investigating three who might face civil charges.

Another 11 have been implicated and Defence is considering whether to sack seven. The other four have faced, or will face, internal action.

General Morrison said Defence had concluded investigations into another 172 mostly army members identified as peripheral to the group's email exchanges. They too may face internal action.

"The Australian Army is overwhelmingly an organisation of 44,000 talented and professional men and women, who serve their country with pride and distinction," he said on Thursday.

"The standard of behaviour we expect of our serving members is clear."

He revealed on Thursday that 122 army members had been sacked this year.

That includes 15 officers and 35 soldiers for misconduct or unacceptable behaviour, one officer and 52 soldiers in relation to drugs and 19 soldiers for civilian offences.

"Where any serious case of misconduct or unacceptable behaviour is proven, the Chief of Army is resolved to take every step available to remove the individual responsible from the army," Defence said in a statement.